It is a Spanish premium subscription number. To subscribe you need to opt-in, either by web (getting a PIN code you need to enter to confirm the subscription) o

It is a Spanish premium subscription number. To subscribe you need to opt-in, either by web (getting a PIN code you need to enter to confirm the subscription) or by SMS (You need to confirm by replying to a free message from the short code). I guess this app is going through SMS opt-in, sending the reply behind the scenes.